BULLETIN 1053, U. S. DEPARTMENT OF AGRICULTURE. 
The lowest temperature tried by him was 10° C. (49° F.), and the 
spores germinated at that temperature. 
Table 1. — Relation of temperature to the germination of basidiospores. 
Germination. 
Species and temperature. 
Per 
cent. 
Taken in— 
Rate. 
Lenzites sepiaria (spores 3 days old): 
12°C 
40 
46 
43 
45 
44 
43 
40 
33 
34 
32 
36 
4 days 
15° C 
20° C 
24 hours [ 30 to 40 /x in 20 hours 
28° C - 
32° C 
do 210 to 350 fj. in 20 hours. 
36° C 
do 1 180 to 250 fjL in 20 hours. 
36 hours Swelling and hepinninp nf t>ihps in 3fi 
40° C 
Lenzites trabea (spores fresh): 
16°C 
3 days 
hours. 
12 to 21 n in 20 hours. 
20° C 
48 hours 
36 hours 
26 hours 
43 to 73 ii in 20 hours. 
24° C 
90 to 143 m in 20 hours. 
28° C 
160 to 245 n in 20 hours 
30° C 
210 to 350 fi in 20 hours. 
32° C 
37 
35 
(a) 
40 
39 
41 
41 
40 
41 
43 
15 

1 
15 
15 
17 
23 
24 
33 
26 
12 
5 
40 
50 
54 
60 
75 
75 
50 
6 to 25 

26 hours 
do 
36 hours 
12 days 
10 days 
6 days 
42 hours 
24 hours 
do 
do 
do 
3 days 
1 month 
9 days 
3 days 
do 
2 days 
24 hours 
do 
do 
do 
do 
10 days 
5 days 
3 days 
2 days 
21 hours 
18 hours 
16 hours 
24 hours 
310 to 450 n in 20 hours 
36° C... 
175 to 200 m in 20 hours 
40° C 
Just beginning in 20 hours. 
7 to 32 n in 12 days. 
15 to 25 u in 8 days. 
Trametes serialis (spores 8 davs old): 
3°C 
9°C 
15° C 
160 to 300 ^ in 3 days. 
20° C 
31 to 68 n in 20 hours. 
25° C 
60 to 80 n in 20 hours. 
28° C 
87 to 125 n in 20 hours. 
32° C 
210 to 235 fi in 20 hours. 
36° C 
Just beginning in 20 hours. 
40°C 
Fomes roseus (spores fresh): 
4°C 
Germination in 1 month. 
8°C 
Germination in 9 days. 
Germination in 3 davs. 
12° C 
16° C 
Just beginning in 20 hours. 
12 to 36 m in 20 hours. 
20° C 
24° C 
57 to 98 fi in 20 hours. 
28° C 
98 to 120 ^ in 20 hours. 
32° C 
84 to 121 m in 20 hours. 
36° C 
Just beginning in 20 hours. 
40° C 
Lentinus lepideus (spores 7 months 
old): 
5°C 
Thalli up to 43 m in 23 days. 
25 to 40 ai in 5 days. 
10° c 
15° C 
50 to 80 n in 5 davs. 
20° C 
43 to 61 a» in 20 hours. 
24° C 
133 to 174 n in 20 hours. 
28°C 
150 to 221 m in 20 hours. 
32° C 
124 to 17S n in 20 hours. 
36° C 
42 to 60 m in 20 hours. 
40° C... . 
Just beginning in 20 hours. 
« Less than 1 per cent. 
The basidiospores of Lenzites trabea germinated in small per- 
centages at 40° C. (104° F.). at high percentages from 24° to 32° C. 
(75° to 89° F.). and most rapidly between 28° and 32° C (82° and 
89° F.). 
The spores of Trametes serialis germinated at the lowest tem- 
perature tried, 3° C. (36° F.), but not at 40° C. (104° F.). The gen- 
eral optimum for percentage was between 20° and 32° C. (68° and 
89° F.), with the most rapid germination between 30° and 32° C. 
(86° and 89° F.). 
